The extra cost is worth it for me.
Also the FET's wear out over time with heavy use on the Walkera ESC's.
I have to replace them after a while on all my helicopters.
I now only use the XP-7A or XP-12A when possible. Never had to replace one either. They keep working great.

Pros: - Oversky ESC/Converter

Fully programmable

Light weight especially if you direct solder to it

Small in size

More headspeed then the WK-WST-10A-LT

Starts the motor much better than the WK-WST-10A-LT

Better timing than the WK-WST-10A-LT

Made to run an outrunner motor

Cons: - Oversky ESC/Converter

Price

Pros - WK-WST-10A-LT

Half the price of the Oversky ESC/Converter

Cons: - WK-WST-10A-LT

Doesn't start a BL motor as well as the Oversky ESC/Converter

Not made for an outrunner motor

Timing isn't the best for an outrunner motor

Not programmable unless you send it to astroid-designs to have a custom
chip installed and have it custom flashed from what I understand

You will still need a BL converter for the two ESC's you listed above unless
astroid-designs flashes it for you. We still don't know for sure if the flash
will work on the Genius CP/Mini CP. I plan to test one and find out.